[TestNG] Warn about usage of io.cucumber.junit.CucumberOptions

testng/src/main/java/io/cucumber/testng/TestNGCucumberOptionsProvider.java

@@ -1,18 +1,36 @@
 package io.cucumber.testng;
 
 import io.cucumber.core.backend.ObjectFactory;
+import io.cucumber.core.logging.Logger;
+import io.cucumber.core.logging.LoggerFactory;
 import io.cucumber.core.options.CucumberOptionsAnnotationParser;
 import io.cucumber.core.snippets.SnippetType;
 
+import java.lang.annotation.Annotation;
+
 final class TestNGCucumberOptionsProvider implements CucumberOptionsAnnotationParser.OptionsProvider {
 
+    private static final Logger log = LoggerFactory.getLogger(TestNGCucumberOptionsProvider.class);
+
     @Override
     public CucumberOptionsAnnotationParser.CucumberOptions getOptions(Class<?> clazz) {
         CucumberOptions annotation = clazz.getAnnotation(CucumberOptions.class);
-        if (annotation == null) {
-            return null;
+        if (annotation != null) {
+            return new TestNGCucumberOptions(annotation);
+        }
+        warnWhenJUnitCucumberOptionsAreUsed(clazz);
+        return null;
+    }
+
+    private static void warnWhenJUnitCucumberOptionsAreUsed(Class<?> clazz) {
+        for (Annotation clazzAnnotation : clazz.getAnnotations()) {
+            String name = clazzAnnotation.annotationType().getName();
+            if ("io.cucumber.junit.CucumberOptions".equals(name)) {
+                log.warn(() -> "Ignoring options provided by " + name + " on " + clazz.getName() + ". " +
+                        "It is recommend to use separate runner classes for JUnit and TestNG."
+                );
+            }
         }
-        return new TestNGCucumberOptions(annotation);
     }
 
     private static class TestNGCucumberOptions implements CucumberOptionsAnnotationParser.CucumberOptions {